Diamesa nowickiana

Author: Kownacki and Kownacka, 1975

Diagnosis (n=2, unless stated otherwise, material in coll. Kownacki)
Exuviae 4.5, 5.0mm long.
Cephalothorax: Frontal setae 150, 235µm long. Thoracic horn 325, 425µm long; ThR 18 (n=1). Precorneal setae 2,3: 110, 180; 100, 125µm long.
Abdomen: Abdominal tergites very nearly devoid of armament other than the posterior tooth rows (031f.jpg). Total dorsal teeth II-VIII 62, 64. Total ventral teeth III-VIII 49+, 51+. Posterior teeth of abdominal tergites 20µm, golden, set on mounds a little paler in colour. (There is a tendency in this species for the dorsal teeth to arise in pairs from the basal mounds.) Ventral teeth narrower and/or as pale as or paler than the dorsal. Relative length segments IX:VIII:VII = 1.0:0.68:0.97 (n=1); relative width segments IX:VIII:VII = 1.0:1.2:1.37 (n=1). Segment VIII 2.3 and segment VII 1.9 times as wide as long (n=1). Lateral setae 1-3 of segments II-VII more or less equidistant, stout almost thorn-like, sometimes forked or branched. Lateral setae 1-4 of segment III 120, 137; 120, 137; 125, 150; 120µm long.
Note: In colour, tan with anterior margin of tergites and lateral adhesion marks brown; paratergites of the same ground colour.
Anal segment: Anal lobe ratio 1.5 (n=1). Each anal lobe with 3 lateral setae; setae pale, without infuscation; length setae 0.9x lobe length (n=1).

Species keys out at Page 573: Diamesinae 49 Diamesa of the Text Key.

Central European alpine regions.
(For more information see module IdentifyIt – file: Other subfamilies).

Ecological notes
Tatra mountains; cold stream at 2,000m asl.